I'm most fluent in English (native-ish?) and I'm also fluent in Thai (native, although not as good as my English). Reasonable level of fluency in Mandarin Chinese and Spanish and an aspiring learner of Swedish.

Yes. It's often spelled with a ฯ at the end to indicate that it's an abbreviation for the full name. (ฯ is a sort of punctuation marker borrowed from Khmer script. In Khmer, it's just used as a period, but in Thai, it's used specifically for short/abbreviated forms).